期刊
MARINE ENVIRONMENTAL RESEARCH
卷 135, 期 -, 页码 123-135出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2018.01.001
关键词
Alexandrium cyst; Great East Japan Earthquake; Ofunato Bay; Sediment; Paralytic shellfish poisoning; Chilean tsunami
资金
- Sustainable Aquatic Food and Environment Project in the East China Sea (SAFE) Project in Nagasaki University
- research project funds, Tohoku Ecosystem-Associated Marine Science Project (Ministry of Education, Culture, Sports, Science, and Technology)
Shellfish aquaculture in Ofunato Bay, Northeast Japan, was seriously damaged by a tsunami generated by the Great East Japan Earthquake, March 11th, 2011, accompanied by paralytic shellfish poisoning (PSP) outbreaks caused by Alexandrium tamarense (Dinophyceae). To understand longer future trends of PSP, an investigation was made of the historical occurrence and causes of Alexandrium outbreaks after the tsunami. Vertical distributions of Alexandrium cysts in two sediment-cores from Ofunato Bay revealed that the sediments above ca. 25 cm were eroded, re-suspended and re-deposited, and they included unusually abundant Alexandrium cysts. This abundance of cysts was due to re-deposition of older sediments by the tsunami. The first Ofunato Bay PSP incident was in 1961 after the Chilean Earthquake tsunami and was probably caused by similar unusual blooms of Alexandrium germinated from older sediments as the Great East Japan tsunami, together with nutrient enrichment because of population increase at the start of shellfish aquaculture.
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